java – 检查Download Manager是否下载了该文件
发布时间:2020-12-15 04:26:27 所属栏目:Java 来源:网络整理
导读:如何检查文件是否已下载并运行其安装?我有一个代码: public void downloadUpdate(String url){ DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); request.setDescription("Downloading..."); request.setTitle("App Updat
如何检查文件是否已下载并运行其安装?我有一个代码:
public void downloadUpdate(String url){ DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); request.setDescription("Downloading..."); request.setTitle("App Update"); request.allowScanningByMediaScanner(); request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); String name = URLUtil.guessFileName(url,null,MimeTypeMap.getFileExtensionFromUrl(url)); request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,name); DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE); manager.enqueue(request); } 解决方法
要检查下载管理器是否已下载该文件,您必须实现BroatcastReceiver.
@Override public void onReceive(Context context,Intent intent) { String action = intent.getAction(); if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) { DownloadManager.Query query = new DownloadManager.Query(); query.setFilterById(intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,0)); DownloadManager manager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE); Cursor cursor = manager.query(query); if (cursor.moveToFirst()) { if (cursor.getCount() > 0) { int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)); if (status == DownloadManager.STATUS_SUCCESSFUL) { String file = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME)); // So something here on success } else { int message = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_REASON)); // So something here on failed. } } } } } 但是,我不确定您是否可以通过编程方式安装APK.出于安全考虑,我认为你不能.对于应用程序更新,我认为您应该使用谷歌版本控制.当您使用不同的版本号重新部署应用时,用户应该能够自动更新(除非用户在Google Play上关闭).希望这会有所帮助. 更新 你不需要调用我提到的方法.您只需要在清单xml文件中声明广播接收器,DownloadManager将在下载完成时调用. xml看起来如下所示: <receiver android:name=".BroadcastReceiver" android:enabled="true" android:exported="true" > <intent-filter> <action android:name="android.intent.action.DOWNLOAD_COMPLETE" /> <action android:name="android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED" /> </intent-filter> </receiver> (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |